Universe Sandbox Alternatives

Celestia - real-time 3D visualization of space.

Build spacecraft, fly them, and try to help the Kerbals to fulfill their ultimate mission of conquering space.

Stellarium is a free open source planetarium for your computer.

3D visualization software for ESA's (European Space Agency) Gaia mission to chart about 1...

Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.

Space Engine is a realistic virtual Universe you can explore on your computer.

The space-based MMO Vendetta Online balances an online trading system with tense ship-to=ship combat.

Star Conflict is a free MMO action game and space simulator that was introduced in 2012.

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3D model of the Solar System and night sky in real time

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Cosmonium is a 3D astronomy and space exploration program.